Collapsible concrete-culvert form.



J. W. KEMPF.

OOLLAPSIBLE CONCRETE .GULVERT FORM.

APPLICATION FILED JULY 7, 191a,

Patnted May 19, 1911 Q SHEETS-SHEET 1.

J. W. KEMPF.

COLLAPSIBLE CONCRETE GULVBRT FORM.

' APPLICATION FILED JULY 7, 1913.

Patented May 19,1914.

2 SHEETS-SHEET 2.

lwumtoz zfoimWfEmpf i r m- M W l j i If 51mm;

3 fully deser cifize Shh of." F 7 1 l L r 1 (flfllfl LAO lexnet; ale/s11 em l'lli' 1% this :spee Tlns u QdlVfillS, 520 consists e.

expansion PI'OYlQlQL shape \Yl so ari'nn. the ClllVLl' be easily a The i 1* {1 (telle ing in (l liiitl means :1 $5 mmlifierl 'Reierm the \iirawi covering ized steel reinfol'eeil and strips of suitable ma tenerl an], cent: to line l n 'ii the sheet and 7 slight Gislance abc for expanding i Strips l) whi 1 which sheuldei i LLL (1S ELL npen Fa enletl May 19, iii-i l.

forming a support for fine expand- Said strips D have slots E H l'l'nnsvesely in the inner faces there- 1 at is adapted to receive the le link F which is aper- -ceptim1 of pivotal pin 1 sieving apertures in the nnted by lelier ll,

has pivotal connec- .mof'lhe pivot I the links F, through the ugertures K in plnbeing provided in order menl' 0f i'ne expansion (le- 76 h \iliilerent sizes of forms.

adapted. to serve as a stop e edge 01" the ether link and pivotal vein in erciei to limit .the movements i: one directiun, 01' in other Words i0 uzlil ijhe links 15270111 moving farther in $516 ilirectien than in alinement with each l which determines the expanding 80 he device. In the drawings 1 have slmnn tnree pairs of said links similarly ennstrncted and pivotally cennectlng the two and 4% the drawings I have 35 "1%, nualifieaiien 0i my invenins Q, have holes vied 550 1'Q6QlV5 inneds S; which latte? Kl L b9111 form 1 i rods 112s. angled inch 1s nclnnlecl in form a s'aen tothe 1 he v. 1 ,2; we all the pen Mnlcn are pasted v invention will be follewsz--The covering upon 311g; frame, the 169 e'zeel form. By in msvement to the bar moved, through the 1 1 iii-sin each. ether an'l' the limit of expansinn the adjustment of the links "l /hen 1 links are parallel with each other, the farm Will have been expanded to its greatest limit. After the concrete has been placed over the 61m and set, ihe he E mu Y be move longitudinally in 0 a movement in 19 Hm expansion. of 111% cm A li! mm (1311;; the form a kmgitudlml the s ips D 50 move i'rm the nabelml resiliency m;

2 bands will 02115:: 1 ue the positimrL 1 in U 1 6f the firm-wild, }?M@1 i0 he I'QMMIBF Wrb.

The epm'atiml of 11 I lntemmdiate 011M covering, V listened t0 the 20 11; to the emls of 'gned t0 rest 1f: the covering J "esaxes whereby, as the mud, imwrdly or outwardly, 25

" d ith as set forth. I hmreunto affix my E MW) witnesses.

that before descmbeti shown in Fig. 1 with 1. 1'; D b dispens 1 i be new 

